JPH02261985A - Flow control valve - Google Patents

Abstract

PURPOSE:To facilitate remove operation for moving a valve body by furnishing a resilient member which energizes opening/closing to either of them, and providing a current supply responsive deforming member, which deforms when current is supplied and which moves the valve body continuously against the energization. CONSTITUTION:If a current supply responsive deforming member 15 is in dead condition, a valve body 8 is moved down by a spring 17 to shut a variable throttle 9, and the area of communication between two ports 5A, 5B is minimized. When rectangular pulses from an operational circuit 16 are supplied to this member 15, it is heated in accordance with the duty ratio of the rectangular pulse and deformed to assume a coil, that causes shortening of its length to raise a shaft 13, which moves the valve body 8 in the direction of opening. As a result the degree of opening of a throttle 9 is increased to enlarge the area of communication between the two ports 5A, 5B. With a control valve 1 in this constitution the degree of opening of the throttle 9 can be adjusted only by controlling the amount of current supply to the deforming member 15, that should facilitate remote operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a flow control valve that can be easily operated remotely.

[Conventional technology]

As a conventional flow control valve, one shown in FIG. 4, for example, is known.

The flow control valve 1 has a valve body 2 composed of a housing 3 and a frame 4 that is fitted onto the housing 3. The housing 3 has an insertion hole 3a passing through it in the axial direction.

The frame body 4 is composed of a cylindrical portion 4a that is fitted onto the housing 3, and a protruding portion 4b that protrudes in the circumferential direction of the cylindrical portion 4a, and a first port 5A provided on the protruding portion 4b is , the insertion hole 3a via the passage 4C, the circumferential groove 3b, and the horizontal hole 3c.
is connected to.

One opening of the insertion hole 3a is provided with an adjustment screw 6 that is screwed into the inner circumferential surface of the insertion hole 3a and can move forward and backward in the axial direction. 6a is fixed,
A needle 6b is fixed to the inner end of the adjustment screw 6.

In addition, at a position facing the needle 6b in the insertion hole 3,
A cylindrical body 7 having a passage 7a penetrating in the axial direction is fixed, and a variable throttle 9 is constituted by one opening of the passage 7a and a valve body 8 formed at the tip of the needle 6b.

Furthermore, the other opening of the insertion hole 3 has a second port 5B.
is provided.

Further, the cylinder 7 has a passage 7b that communicates the inside and outside thereof, and the inner peripheral surface of the insertion hole 3 and the outer surface of the cylinder 7 are connected on the needle 6b side from the opening of the passage 7b. A check seal 10 is interposed in between to prevent flow from the second port 5B side. In addition, 11a, 11b and li
e is a sealing member, and 12 is a lock nut.

Therefore, if this flow control valve 1 is represented by the JIS symbol, the fifth
The result will be as shown in the figure.

Then, by manually turning the rotary knob 6a to move the adjusting screw 6 forward or backward, and moving the valve body 8 in either direction to open or close (up or down), the opening degree of the variable throttle 9, that is, the gap between the ports 5A and 5B can be changed. The communication area is continuously variable.

[Problem to be solved by the invention]

However, in the conventional flow control valve 1 described above, the communication area between both ports 5A and 5B is adjusted by rotating the rotary knob 6a. If it is installed in a high place (for example, in a place where piping is crowded), it will be very difficult to operate, and the variable throttle 9 will be synchronized with the movement of fluid pressure equipment (for example, a pneumatic cylinder, etc.). There was an unresolved issue that it was difficult to do so.

Conventionally, this problem has been solved by driving the adjustment screw 6 with an electric motor or the like to enable remote control, or by installing the flow control valve in a location where it can be easily operated, such as by extending the piping. This problem was solved by moving the flow control valve, but this was not a sufficient solution as it led to an increase in the size and cost of the flow control valve.

Therefore, the present invention has been made by focusing on the unresolved problems of the conventional technology, and aims to provide a flow rate control valve that can be easily operated remotely.

[Means to solve the problem]

In order to achieve the above object, the vLt control valve of the present invention has first and second ports provided in a valve body, and a communication area between the first and second ports by moving within the valve body. A continuously variable valve body, an elastic body that biases the valve body to either open or close, and deforms when energized to continuously move the valve body against the bias of the elastic body. An energized deformable member.

[Effect]

When the amount of current applied to the energized deformable member is zero, the valve body is maintained at a position determined by the biasing force of the elastic body, and the communication area between the first and second ports is maximized or minimized.

Then, when the energized deformable member is energized and deformed,
Since the valve body moves against the bias of the elastic body, the communication area between the first and second ports continuously increases or decreases.

(Example〕 Embodiments of the present invention will be described below based on the drawings.

1 and 2 show an embodiment of the present invention. Note that the same reference numerals are given to the same or equivalent members and parts as in FIG. 4 used in the conventional explanation, and the redundant explanation thereof will be omitted.

First, the configuration will be explained.

In FIG. 1, a valve body 8 is fixed to the tip of the insertion hole 3a.
The shaft 13 inside passes through a partition wall 14 provided on the inner circumferential surface of the insertion hole 3a, and its upper end is fixed to an electrically deformable member 15 made of a shape memory alloy. Note that a sealing member f4a that fits onto the shaft 13 is embedded in the partition wall 14.

Both ends of the energizing deformable member 15 are fixed to terminals 15a and 15b fixed to the housing 3, the center part is fixed to the upper end of the shaft 13, and both terminals 15a and 15b are connected to the operating circuit 16. has been done.

The operating circuit 16 supplies continuous rectangular pulses at a predetermined voltage and a predetermined frequency to the energized deformable member 15 through the ii4 terminals 15a and 15b. Note that the duty ratio of the rectangular pulse can be adjusted to an arbitrary value by, for example, changing the resistance value of a semi-fixed resistor (not shown) in the operating circuit 16.

When the energized deformable member 15 is supplied with continuous rectangular pulses and becomes energized, it generates heat due to its own electrical resistance and deforms into a coil shape (recovers its shape). Its calorific value,
In other words, the amount of deformation changes linearly according to the duty ratio of the supplied rectangular pulse, and in the non-energized state (duty ratio is zero), the energized deformable member 15 as shown in FIG. 2(a). The amount of deformation is zero, but as the duty ratio increases, the amount of deformation also increases continuously, and when a rectangular pulse with a certain duty ratio is supplied, as shown in Fig. 2 (b)
The maximum amount of deformation shown in is obtained. Note that the energizing deformable member 15 does not necessarily have to have a shape memorized in a coil shape, and may be made to expand and contract while remaining in a linear shape.

Further, between the valve body and the partition wall 14, there is a spring 17 as an elastic body that biases the valve body 8 in the direction in which the variable throttle 9 closes.
It is inserted coaxially with the shaft 13.

And, if this flow control valve 1e is expressed in JIS symbol, the fourth
The flow control valve shown in FIG. 5 is similar to the flow control valve described in the figure.

Next, the operation of the above embodiment will be explained.

When the energized deformable member 15 is in a non-energized state, the valve body 8 is moved downward by the spring 17, so the variable throttle 9 is closed and the communication area between both ports 5A and 5B is in the minimum state (first port )5A to the second port 5B is determined by the check seal 10, and the flow rate from the second port)5B to the first port
The flow rate to port 5A is zero. ).

Then, when the rectangular pulse outputted by the operating circuit 16 is supplied to the energized deformable member 15, the energized deformable member 15 is heated and deformed into a coil shape according to the duty ratio of the rectangular pulse at that time.

When the energized deformable member 15 is deformed into a coil shape, its length becomes shorter, so the shaft 13 rises and the valve body 8 moves in the opening direction.As a result, the opening degree of the variable restrictor 9 increases, The communication area between 5A and 5B becomes larger.

From this state, for example, if the duty ratio of the rectangular pulse outputted by the actuating circuit 16 is decreased, the amount of heat generated by the energized deformable member 15 will be lowered, and the amount of deformation thereof will be reduced.
The valve body 8 is lowered by the biasing force 7, the opening degree of the variable throttle 9 is reduced, and the communication area between both ports 5A and 5B becomes smaller. Conversely, if the duty ratio of the rectangular pulse is increased, the energization deformation is reduced. Since the amount of deformation of the member 15 increases, both ports 5A
The communication area between and 5B becomes even larger.

As described above, according to the flow rate control valve 1 of the above embodiment, the opening degree of the variable throttle 9 can be adjusted by simply controlling the amount of current applied to the energized deformable member 15, that is, the duty ratio of the rectangular pulse outputted by the actuating circuit 16. can be adjusted.

Therefore, even if the flow control valve 1 is placed in a difficult-to-reach location, if the actuation circuit 16 is placed inside the operation chamber,
Adjustment of the flow rate control valve 1 can be easily performed by remote control.

Moreover, since an electric motor, a speed reducer, etc. are not required, the flow control valve 1 does not become larger or the cost increases.

In the above embodiment, the amount of deformation is adjusted by changing the duty ratio of the continuous rectangular pulses supplied to the energized deformable member 15, but the present invention is not limited to this, and for example, It is also possible to fix the duty ratio and adjust the amount of deformation by changing the voltage value of the rectangular pulse.

Further, in the above embodiment, the spring 17 biases the valve body 8 in the closing direction, but it may be biased in the opposite direction to open the valve body 8. In that case, the energized deformable member 15 is
The valve body 8 may be moved in the closing direction by energization and deformation.

Furthermore, the configurations of the energized deformable member 15 and the spring 17 are not limited to the above embodiments. For example, as shown in FIG. 3, a bias spring 25 is used as the elastic body, and the energized deformable member is An alloy wire 26,
It is also conceivable that the wire 26 is passed through a thick plastic pipe 27 and a thin plastic pipe 28 telescopically engaged with the thick plastic pipe 27, and both ends of the wire are stretched using maple terminals 29.

Then, when the wire 26 is energized, the wire 26 generates heat due to its own electrical resistance, and the wire 26 due to the temperature change.
Since this member expands and contracts due to the balance between the contraction force of 6 and the biasing force of the bias spring 25, the valve body 8 is fixed to one end of this member, and the other end is fixed to the upper end surface of the insertion hole 3a.
By connecting both ends of the wire 26 to the actuating circuit 16, the same effects as in the above embodiment can be obtained.

〔Effect of the invention〕

As explained above, according to the flow control valve of the present invention, the movement of the valve body that moves within the valve body to continuously vary the communication area between the first and second ports is controlled by moving the valve body. This is done using an elastic body that biases the valve to open or close, and an energized deformable member that deforms when energized and continuously moves the valve body against the bias of the elastic body. Since the communication area between the first and second ports can be adjusted simply by controlling the amount, remote scraping can be easily performed without increasing the size of the flow control valve or increasing costs. .

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the configuration of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the amount of deformation of the energized deformable member in this embodiment. ) represents the time of maximum deformation. FIG. 3 is a front view showing another example of the energized deformable member and the elastic body, FIG. 4 is a sectional view showing the configuration of a conventional flow control valve, and FIG. 5 is a flow rate explained in the above embodiment and conventional example. It is a diagram showing a control valve using JIS symbols. 1...Flow rate control valve, 2...Valve body, 5A...First
Port, 5B...Second port, 8...Valve body, 15.
...Electricity deformable member, 17... Spring (elastic body), 25.
...Bias spring (elastic body), 26...wire (current-carrying deformable member). Patent distributor Jun Co., Ltd.

Claims (1)

[Claims] (1) First and second ports provided in a valve body, a valve body that moves within the valve body to continuously vary the communication area between the first and second ports, and this valve body. The valve body is characterized by comprising an elastic body that biases the valve body to either open or close, and an energized deformable member that deforms when energized and continuously moves the valve body against the bias of the elastic body. Flow control valve.